The fixer (your sixth chem) should be rinsed for 4:00 min.

If you have a small drum you could try one roll at 6:30 and the other at 6:45 (I have found that re-using the Kodak E6 works fine if used right away) and see what you like.

Again, it is super important that you follow the rules exactly i.e., 200ml of water, chem, finish with your desired level of chem to, for example, 1000ml. This with mixing at each of these steps. Don't let the Jobo do it for you as it will seperate in the holding bottle and the draw tube sucks from the bottom.